Feature to compare two pictures and return the value of similarity percentage

Now the wait for image function is not flexible to compare real-time captured images, I believe RPAe has a built-in function to compare images, so could we open the function to compare images? Whatever pre-programmed or real-time captured.
Thank you!

Now I have some pictures in a folder, I need to find one or some pictures which are with a certain similarity to a captured picture. Could we add this feature?
Thanks a lot!

@ashapkina